This patch from Antti Tapaninen added the --omit-dir-changes option, which
tells rsync to not affect any attributes on the directories in the transfer.

To use this patch, run these commands for a successful build:

    patch -p1 <patches/omit-dir-changes.diff
    ./configure                              (optional if already run)
    make

based-on: 1ddcdaf3f6808ba53aef9e19f630a18808de22ac
diff --git a/generator.c b/generator.c
--- a/generator.c
+++ b/generator.c
@@ -44,6 +44,7 @@ extern int preserve_hard_links;
 extern int preserve_executability;
 extern int preserve_perms;
 extern int preserve_times;
+extern int omit_dir_changes;
 extern int delete_mode;
 extern int delete_before;
 extern int delete_during;
@@ -667,6 +668,7 @@ void itemize(const char *fnamecmp, struct file_struct *file, int ndx, int statre
 	     const char *xname)
 {
 	if (statret >= 0) { /* A from-dest-dir statret can == 1! */
+		int omit_changes = omit_dir_changes && S_ISDIR(sxp->st.st_mode);
 		int keep_time = !preserve_times ? 0
 		    : S_ISDIR(file->mode) ? preserve_times & PRESERVE_DIR_TIMES
 		    : S_ISLNK(file->mode) ? preserve_times & PRESERVE_LINK_TIMES
@@ -693,10 +695,11 @@ void itemize(const char *fnamecmp, struct file_struct *file, int ndx, int statre
 		} else if (preserve_executability
 		 && ((sxp->st.st_mode & 0111 ? 1 : 0) ^ (file->mode & 0111 ? 1 : 0)))
 			iflags |= ITEM_REPORT_PERMS;
-		if (uid_ndx && am_root && (uid_t)F_OWNER(file) != sxp->st.st_uid)
+		if (uid_ndx && am_root && !omit_changes
+		 && (uid_t)F_OWNER(file) != sxp->st.st_uid)
 			iflags |= ITEM_REPORT_OWNER;
-		if (gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
-		    && sxp->st.st_gid != (gid_t)F_GROUP(file))
+		if (gid_ndx && !omit_changes
+		 && !(file->flags & FLAG_SKIP_GROUP) && sxp->st.st_gid != (gid_t)F_GROUP(file))
 			iflags |= ITEM_REPORT_GROUP;
 #ifdef SUPPORT_ACLS
 		if (preserve_acls && !S_ISLNK(file->mode)) {
@@ -1487,7 +1490,7 @@ static void recv_generator(char *fname, struct file_struct *file, int ndx,
 		real_sx = sx;
 		if (file->flags & FLAG_DIR_CREATED)
 			statret = -1;
-		if (!preserve_perms) { /* See comment in non-dir code below. */
+		if (!preserve_perms || omit_dir_changes) { /* See comment in non-dir code below. */
 			file->mode = dest_mode(file->mode, sx.st.st_mode,
 					       dflt_perms, statret == 0);
 		}
diff --git a/options.c b/options.c
--- a/options.c
+++ b/options.c
@@ -59,6 +59,7 @@ int preserve_specials = 0;
 int preserve_uid = 0;
 int preserve_gid = 0;
 int preserve_times = 0;
+int omit_dir_changes = 0;
 int update_only = 0;
 int cvs_exclude = 0;
 int dry_run = 0;
@@ -352,6 +353,7 @@ void usage(enum logcode F)
   rprintf(F," -D                          same as --devices --specials\n");
   rprintf(F," -t, --times                 preserve modification times\n");
   rprintf(F," -O, --omit-dir-times        omit directories from --times\n");
+  rprintf(F,"     --omit-dir-changes      omit directories from any attribute changes\n");
   rprintf(F,"     --super                 receiver attempts super-user activities\n");
 #ifdef SUPPORT_XATTRS
   rprintf(F,"     --fake-super            store/recover privileged attrs using xattrs\n");
@@ -492,6 +494,7 @@ static struct poptOption long_options[] = {
   {"omit-dir-times",  'O', POPT_ARG_VAL,    &omit_dir_times, 1, 0, 0 },
   {"no-omit-dir-times",0,  POPT_ARG_VAL,    &omit_dir_times, 0, 0, 0 },
   {"no-O",             0,  POPT_ARG_VAL,    &omit_dir_times, 0, 0, 0 },
+  {"omit-dir-changes", 0,  POPT_ARG_NONE,   &omit_dir_changes, 0, 0, 0 },
   {"modify-window",    0,  POPT_ARG_INT,    &modify_window, OPT_MODIFY_WINDOW, 0, 0 },
   {"super",            0,  POPT_ARG_VAL,    &am_root, 2, 0, 0 },
   {"no-super",         0,  POPT_ARG_VAL,    &am_root, 0, 0, 0 },
@@ -1515,6 +1518,9 @@ int parse_arguments(int *argc_p, const char ***argv_p)
 		parse_rule(&filter_list, backup_dir_buf, 0, 0);
 	}
 
+	if (omit_dir_changes)
+		omit_dir_times = 1;
+
 	if (preserve_times) {
 		preserve_times = PRESERVE_FILE_TIMES;
 		if (!omit_dir_times)
@@ -1758,6 +1764,8 @@ void server_options(char **args, int *argc_p)
 			argstr[x++] = 'm';
 		if (omit_dir_times)
 			argstr[x++] = 'O';
+		if (omit_dir_changes == 1)
+			args[ac++] = "--omit-dir-changes";
 	} else {
 		if (copy_links)
 			argstr[x++] = 'L';
diff --git a/rsync.c b/rsync.c
--- a/rsync.c
+++ b/rsync.c
@@ -34,6 +34,7 @@ extern int preserve_xattrs;
 extern int preserve_perms;
 extern int preserve_executability;
 extern int preserve_times;
+extern int omit_dir_changes;
 extern int am_root;
 extern int am_server;
 extern int am_sender;
@@ -441,9 +442,11 @@ int set_file_attrs(const char *fname, struct file_struct *file, stat_x *sxp,
 			file->flags |= FLAG_TIME_FAILED;
 	}
 
-	change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file);
+	change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file)
+		  && !(omit_dir_changes && S_ISDIR(sxp->st.st_mode));
 	change_gid = gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
-		  && sxp->st.st_gid != (gid_t)F_GROUP(file);
+		  && sxp->st.st_gid != (gid_t)F_GROUP(file)
+		  && !(omit_dir_changes && S_ISDIR(sxp->st.st_mode));
 #ifndef CAN_CHOWN_SYMLINK
 	if (S_ISLNK(sxp->st.st_mode)) {
 		;
diff --git a/rsync.yo b/rsync.yo
--- a/rsync.yo
+++ b/rsync.yo
@@ -353,6 +353,7 @@ to the detailed description below for a complete description.  verb(
  -D                          same as --devices --specials
  -t, --times                 preserve modification times
  -O, --omit-dir-times        omit directories from --times
+     --omit-dir-changes      omit directories from any attribute changes
      --super                 receiver attempts super-user activities
      --fake-super            store/recover privileged attrs using xattrs
  -S, --sparse                handle sparse files efficiently
@@ -1058,6 +1059,10 @@ it is preserving modification times (see bf(--times)).  If NFS is sharing
 the directories on the receiving side, it is a good idea to use bf(-O).
 This option is inferred if you use bf(--backup) without bf(--backup-dir).
 
+dit(bf(--omit-dir-changes)) This tells rsync to omit directories when applying
+any preserved attributes (owner, group, times, permissions) to already existing
+directories.
+
 dit(bf(--super)) This tells the receiving side to attempt super-user
 activities even if the receiving rsync wasn't run by the super-user.  These
 activities include: preserving users via the bf(--owner) option, preserving
diff -up a/rsync.1 b/rsync.1
--- a/rsync.1
+++ b/rsync.1
@@ -428,6 +428,7 @@ to the detailed description below for a
  \-D                          same as \-\-devices \-\-specials
  \-t, \-\-times                 preserve modification times
  \-O, \-\-omit\-dir\-times        omit directories from \-\-times
+     \-\-omit\-dir\-changes      omit directories from any attribute changes
      \-\-super                 receiver attempts super\-user activities
      \-\-fake\-super            store/recover privileged attrs using xattrs
  \-S, \-\-sparse                handle sparse files efficiently
@@ -1221,6 +1222,11 @@ it is preserving modification times (see
 the directories on the receiving side, it is a good idea to use \fB\-O\fP.
 This option is inferred if you use \fB\-\-backup\fP without \fB\-\-backup\-dir\fP.
 .IP 
+.IP "\fB\-\-omit\-dir\-changes\fP"
+This tells rsync to omit directories when applying
+any preserved attributes (owner, group, times, permissions) to already existing
+directories.
+.IP 
 .IP "\fB\-\-super\fP"
 This tells the receiving side to attempt super\-user
 activities even if the receiving rsync wasn\(cq\&t run by the super\-user.  These
